Social media users flocked to Twitter to share concerns on the incident.

One said: "Loads of police at Wood Green station!"

Another said: “What’s going on at #WoodGreen tube? Just pulled up into the station and armed police officers with machine guns shouted at us all to stay on the train, both platforms otherwise empty. Weird stuff, stay safe out there fam!”

Wood Green is located in north London (Image: GOOGLEMAPS)

Another social media user added: “I nearly got run over by an undercover car and then 3 cops peeled off the streets like a movie scene with helicopters around.”